graphile-utils/node8plus/makeChangeNullabilityPlugin.js

Utilities to help with building graphile-build plugins

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function makeChangeNullabilityPlugin(rules) {
    return (builder, _options) => {
        function changeNullability(field, build, context) {
            const { Self, scope: { fieldName }, } = context;
            const typeRules = rules[Self.name];
            if (!typeRules) {
                return field;
            }
            const shouldBeNullable = typeRules[fieldName];
            if (shouldBeNullable == null) {
                return field;
            }
            const { graphql: { getNullableType, GraphQLNonNull }, } = build;
            const nullableType = getNullableType(field.type);
            return Object.assign(Object.assign({}, field), { type: shouldBeNullable
                    ? nullableType
                    : nullableType === field.type
                        ? new GraphQLNonNull(field.type)
                        : field.type });
        }
        builder.hook("GraphQLInputObjectType:fields:field", changeNullability);
        builder.hook("GraphQLObjectType:fields:field", changeNullability);
    };
}
exports.default = makeChangeNullabilityPlugin;
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